Hmm. They were able to retrieve data off of the old unit for a backup? That’s odd because they shouldn’t be able to do that if the flash failed. Did they first try reflashing the firmware from recovery mode? Sounds to me like you may not have needed a new MCU.
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MCU fails for the second time
- Thread starter andyrebele
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- mcu Model S touch screen
Hmm. They were able to retrieve data off of the old unit for a backup? That’s odd because they shouldn’t be able to do that if the flash failed. Did they first try reflashing the firmware from recovery mode? Sounds to me like you may not have needed a new MCU.
Doesn't that depend on the failure mode? Maybe the old MCU could still read from the eMMC but not write to it.
If it could still read from the eMMC and boot the OS then the UI should still have worked. It would just lose settings on every reboot since it couldn’t store in non volatile memory.
Depends if the boot/operation process requires writing to logs, updating VPN passwords/settings, etc. (i.e. the car isn't designed to operate in read-only mode.)
Well, emmc often is not 100% dead, you get some firmware files dead but not /var or /home pretty often, I heard. Not only that, it stores some backups on IC as well.
boilerbots
Member
Is this a systemic problem? The MCU on my Model S from May 2013 also just failed. The screen would light up then go out and the touch screen failed constantly. It seemed like the computer was sleeping and waking up. The error codes pointed to a problem with the 3G modem so they swapped it by no luck so they say it needed the whole MCU unit.
I requested to keep the original unit for my own diagnostics and spare parts but they denied me. They said that they can request that the failure is investigated internally and give me a report. For $2500 I feel I should get the old unit or get some credit for it’s return, like 50%. They then told me the units are sent in to be refurbished!
I requested to keep the original unit for my own diagnostics and spare parts but they denied me. They said that they can request that the failure is investigated internally and give me a report. For $2500 I feel I should get the old unit or get some credit for it’s return, like 50%. They then told me the units are sent in to be refurbished!
ucmndd
Well-Known Member
If you paid full price for the repair out of pocket they’re required by law to give you the old parts if you ask for them.
You need to push them on this, the part belongs to you and they are required to return it to you if you ask.
boilerbots
Member
Just tell them that since the part is yours if they really want to keep it they can have it for the low low price of $2,500.
If the parts are replaced under warranty Tesla has the right to keep it. If you pay for the repair the part is yours's. I went through the same thing several months ago when I paid to have my DC to DC converter replaced. I had to email them state law showing that I an entitled to my old parts by law.
Did you ever get it back?
I had the MCU fail on my 2013 MS/40 (all displays black, would not drive/charge; towed to SC), had to pay full price for the replacement.
I asked for the old MCU back before work began, they agreed. Upon picking up the car; they refused to give it back. I showed them the California law (no core credit, no warranty, paid full price), they still refused and said they need further instructions/documentation from Tesla HQ.
The new MCU is LTE.
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So Tesla is knowingly breaking state laws, I would request everyone's name in that service center. Also you should send them an email and certified letter requesting your parts back. That way you have a record, not just a verbal request.
You could just let them know that you will sue them in small claims court for the cost of the MCU (minus a few hundred for the cost to repair it) if they don't return it.
I'll give them a few days to sort it out with the Tesla mothership; hopefully it's just confusion on their part.
I told them I want the part back or a significant core credit. I recorded the conversation with their permission and wrote down the return contingency on the invoice before signing.
If they still refuse, I'll file a complaint with the California Bureau of Automotive Repair. Small claims if absolutely necessary.
Also your new mcu has a one year 12000 Mile warranty since you paid for it. Make sure you inspect it before that is up!
Mine developed the yellow border less than a year and they will replace it under warranty. Yours will probably have the same issue.
Mine developed the yellow border less than a year and they will replace it under warranty. Yours will probably have the same issue.
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